PCAT scoring

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Your percentile score is based on how people have historically scored on this exam (despite having changed) from 1998-2003. You will never really know how many you've missed. I think scoring higher in the math and chemistry section will bring your score up more, at least it did for me.
 
On a completely different side note: What is the COMMON(not IUPAC) name for that compound?

I was thinking Diacetyl something... 😕